CN114772972B - Concrete mineral admixture based on concrete waste slurry and preparation method thereof - Google Patents
Concrete mineral admixture based on concrete waste slurry and preparation method thereof Download PDFInfo
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- CN114772972B CN114772972B CN202210495671.4A CN202210495671A CN114772972B CN 114772972 B CN114772972 B CN 114772972B CN 202210495671 A CN202210495671 A CN 202210495671A CN 114772972 B CN114772972 B CN 114772972B
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- 239000004567 concrete Substances 0.000 title claims abstract description 213
- 239000002002 slurry Substances 0.000 title claims abstract description 136
- 239000002699 waste material Substances 0.000 title claims abstract description 136
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 68
- 239000011707 mineral Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title abstract description 34
- 238000007613 slurry method Methods 0.000 title description 2
- 238000000227 grinding Methods 0.000 claims abstract description 87
- 239000013078 crystal Substances 0.000 claims abstract description 60
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 239000010881 fly ash Substances 0.000 claims abstract description 31
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 26
- 239000010440 gypsum Substances 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 12
- 239000005416 organic matter Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 12
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 11
- 238000007873 sieving Methods 0.000 claims description 11
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 11
- 235000011152 sodium sulphate Nutrition 0.000 claims description 11
- 238000000967 suction filtration Methods 0.000 claims description 11
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229920005862 polyol Polymers 0.000 claims description 3
- 150000003077 polyols Chemical class 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 22
- 239000000463 material Substances 0.000 abstract description 21
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000084 colloidal system Substances 0.000 description 9
- 239000008399 tap water Substances 0.000 description 9
- 235000020679 tap water Nutrition 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000007630 basic procedure Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011374 ultra-high-performance concrete Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/0086—Seeding materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a concrete mineral admixture based on concrete waste slurry and a preparation method thereof, wherein the concrete mineral admixture comprises concrete waste slurry dry material, fly ash, seed crystals, desulfurized gypsum, grinding aids and soluble organic matters, and the seed crystals are prepared from the concrete waste slurry; the preparation method comprises the steps of uniformly mixing the concrete waste slurry, the fly ash and the desulfurized gypsum, adding the grinding aid and the soluble organic matters for grinding, then adding the seed crystal for mixing and grinding, and obtaining the concrete mineral admixture. The admixture has the advantages of small fineness, high activity index, low sulfur trioxide content and excellent properties of products. The method takes the concrete waste slurry as a raw material to prepare the seed crystal, and uses the seed crystal in the preparation of the concrete admixture by using the concrete waste slurry, thereby effectively solving the problem of low strength in the existing preparation of the concrete admixture by using the concrete waste slurry.
Description
Technical Field
The invention belongs to the field of concrete mineral admixture, and particularly relates to a concrete mineral admixture based on concrete waste slurry and a preparation method thereof.
Background
The mineral admixture has pozzolanic activity effect, micro aggregate filling effect and particle morphology effect, has remarkable improvement effects on fluidity, mechanical property, durability and the like of concrete, and is called a sixth component of the concrete except cement, sand, stone, admixture and water. Along with the demands of green construction and green production, the price of cement is gradually increased, and the mineral admixture has higher activity and excellent performance, and can partially replace cement to produce concrete, thereby improving the performance of the concrete. The preparation of concrete mineral admixtures from industrial waste residues is a hotspot field in concrete research.
A large amount of concrete waste slurry and concrete wastewater are generated in the concrete mixing plant every year, a small amount of concrete waste slurry and a large amount of concrete wastewater are recycled in concrete production, and a large amount of concrete waste slurry is processed in landfill and accumulation, so that the environment is extremely adversely affected. The concrete waste slurry is prepared into the concrete mineral admixture through a certain technical process, so that the resource utilization problem of the concrete waste slurry is realized, the problem of the shortage of concrete production raw materials is solved, and the method has remarkable social and economic benefits.
The prior art CN202110697191.1 discloses a method for preparing an ultra-high performance concrete admixture by utilizing concrete waste slurry, wherein the concrete powder admixture is prepared by means of surface activation, modification and the like of the concrete waste slurry, so that the problem of reduced concrete performance caused by taking the concrete waste slurry as a high performance concrete admixture is solved, and the recycling and refined high-end utilization of the concrete waste slurry are realized. However, a large amount of chemicals such as nitric acid, ferric chloride, sodium hydroxide and the like are consumed, the preparation method is complex, and the large-scale treatment and utilization of the concrete waste slurry cannot be realized.
Disclosure of Invention
The invention aims to: the first object of the invention is to provide a concrete mineral admixture which can effectively improve the activity of concrete waste slurry without adopting an additive, thereby solving the problem of low strength existing in the preparation of the concrete admixture by using the existing concrete waste slurry dry material.
The technical scheme is as follows: the invention relates to a concrete mineral admixture based on concrete waste slurry, which comprises the following raw materials in parts by weight: 50-60 parts of concrete waste slurry, 30-40 parts of fly ash, 5-10 parts of seed crystal, 0-5 parts of desulfurized gypsum, 0.1-0.2 part of grinding aid and 0.05-0.1 part of soluble organic matters; the seed crystal is prepared from concrete waste slurry.
According to the invention, the seed crystal is prepared from the concrete waste slurry, and then the seed crystal and the concrete waste slurry dry material are compounded to prepare the concrete mineral admixture, so that the activity of the concrete waste slurry is effectively improved, and the problem of low strength in the existing concrete admixture prepared from the concrete waste slurry dry material is solved. Meanwhile, the soluble organic matters are added into the concrete mineral admixture, so that the problems of large water demand and small fluidity existing in the preparation of the admixture by adding the concrete waste slurry and the concrete waste slurry dry material are effectively solved.
Further, the seed crystal in the admixture is prepared by the following steps: adjusting the mass concentration of the concrete waste slurry to 5-10%, adding sodium sulfate accounting for 0.2-0.4% of the mass of the concrete waste slurry, reacting for 20-24h at 70-80 ℃, drying for 6-8h at 60-65 ℃ after suction filtration, and grinding to obtain the seed crystal.
In the preparation step of the seed crystal, before the mass concentration of the concrete waste slurry is regulated, the concrete waste slurry is sieved by a sieve of 45-80 mu m, and is ground for 2-3 hours after sieving, so that the colloidal concrete waste slurry which does not precipitate is prepared.
Further, the seed crystals in the admixture have a particle size of 4-6 μm.
Further, the grinding aid in the admixture is a mixture of triethanolamine and triglyceride in a mass ratio of 1:0.5-1.
Further, the soluble organic matters in the admixture are polyether polyol and polyethylene glycol mixture with the mass ratio of 1:0.8-1.
Further, the concrete waste slurry in the admixture comprises the following components in percentage by mass: siO (SiO) 2 38-42％，CaO 35-40％，Al 2 O 3 7-9％，Fe 2 O 3 5-8% and 4-6% MgO.
Further, siO in fly ash in the admixture 2 The content is more than or equal to 50 percent, al 2 O 3 The content is more than or equal to 20 percent, and the fineness of the screen residue of 45 mu m is less than or equal to 20 percent.
Further, caSO in the desulfurized gypsum in the admixture 4 ≥40％。
The method for preparing the concrete mineral admixture comprises the following steps: mixing the concrete waste slurry, the fly ash and the desulfurized gypsum uniformly, adding the grinding aid and the soluble organic matters, grinding for 20-30min, adding the seed crystal, and mixing and grinding for 5-10min to obtain the concrete mineral admixture.
The beneficial effects are that: compared with the prior art, the invention has the remarkable advantages that: the admixture has the advantages of small fineness, high activity index, low sulfur trioxide content and excellent properties of products. The method takes the concrete waste slurry as a raw material to prepare the seed crystal, and uses the seed crystal in the preparation of the concrete admixture by using the concrete waste slurry, thereby effectively solving the problem of low strength in the existing preparation of the concrete admixture by using the concrete waste slurry.
Detailed Description
The technical scheme of the invention is further described in detail below by combining examples.
The raw materials used in the present invention are commercially available. Wherein, the concrete waste slurry is obtained by drying solid-liquid mixture concrete waste slurry containing powder particles formed by cleaning a stirrer, a concrete transport vehicle, experimental equipment and plastic waste residues of a sand-stone separator in a ready-mix factory, and the chemical components comprise SiO 2 38-42％，CaO 35-40％，Al 2 O 3 7-9％，Fe 2 O 3 5-8% and 4-6% MgO.
The grinding aid is hyperbranched polyurethane grinding aid, is synthesized by esterification reaction of triethanolamine and triglyceride according to the proportion of 1:0.5-1, and belongs to macromolecular grinding aid. Specifically, the preparation method comprises the following steps: the triethanolamine and the triglyceride are reacted for 1 to 2 hours at the temperature of 60 to 90 ℃, diluted after the reaction is finished, cooled to room temperature, and then the pH value is regulated to be neutral by adopting NaOH.
The soluble organic matter is prepared by mixing polyether polyol and polyethylene glycol according to the proportion of 1:0.8-1. SiO in fly ash 2 The content is more than or equal to 50 percent, al 2 O 3 The content is more than or equal to 20 percent, and the fineness of the screen residue of 45 mu m is less than or equal to 20 percent. CaSO in desulfurized gypsum 4 ≥40％。
Example 1
The raw materials used for the concrete mineral admixture of this example are shown in table 1 below.
TABLE 1 composition of raw materials used in example 1
| Raw materials | Concrete waste slurry dry material | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 50 | 40 | 5 | 5 | 0.1 | 0.05 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with a 45-80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 2 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 5%;
(3) Adding sodium sulfate accounting for 0.4% of the mass of the concrete waste slurry, reacting for 20 hours at the temperature of 70 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 60 ℃ for 6 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material, the fly ash and the desulfurized gypsum;
(2) Grinding aid and soluble organic matters are added, and grinding is carried out for 20min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 5min to obtain the concrete mineral admixture based on the concrete waste slurry.
Example 2
The raw materials used for the mineral admixture of this example are shown in table 2 below.
TABLE 2 composition of raw materials used in EXAMPLE 2
| Raw materials | Concrete waste slurry dry material | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 52 | 38 | 6 | 4 | 0.1 | 0.06 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with a 45-80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 2 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 6%;
(3) Adding sodium sulfate accounting for 0.35% of the mass of the concrete waste slurry, reacting for 21 hours at the temperature of 72 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 60 ℃ for 6 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material, the fly ash and the desulfurized gypsum;
(2) Grinding aid and soluble organic matters are added, and grinding is carried out for 20min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 6min to obtain the concrete mineral admixture based on the concrete waste slurry.
Example 3
The raw materials used for the mineral admixture of this example are shown in Table 3 below.
TABLE 3 composition of raw materials used in EXAMPLE 3
| Raw materials | Concrete waste slurry dry material | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 54 | 36 | 7 | 3 | 0.15 | 0.07 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with a 45-80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 2.5 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 7%;
(3) Adding sodium sulfate accounting for 0.3% of the mass of the concrete waste slurry, reacting for 22 hours at the temperature of 75 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 63 ℃ for 7 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material, the fly ash and the desulfurized gypsum;
(2) Grinding aid and soluble organic matters are added, and grinding is carried out for 25min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 7min to obtain the concrete mineral admixture based on the concrete waste slurry.
Example 4
The raw materials used for the mineral admixture of this example are shown in table 4 below.
TABLE 4 composition of raw materials used in EXAMPLE 4
| Raw materials | Concrete waste slurry dry material | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 56 | 34 | 8 | 2 | 0.15 | 0.08 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with a 45-80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 2.5 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 8%;
(3) Adding sodium sulfate accounting for 0.25% of the mass of the concrete waste slurry, reacting for 23 hours at the temperature of 75 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 63 ℃ for 7 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material, the fly ash and the desulfurized gypsum;
(2) Grinding aid and soluble organic matters are added, and grinding is carried out for 25min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 8min to obtain the concrete mineral admixture based on the concrete waste slurry.
Example 5
The raw materials used for the mineral admixture of this example are shown in Table 5 below.
TABLE 5 composition of raw materials used in EXAMPLE 5
| Raw materials | Concrete waste slurry | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 58 | 32 | 9 | 1 | 0.2 | 0.09 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with a 45-80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 3 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 9%;
(3) Adding sodium sulfate accounting for 0.2% of the mass of the concrete waste slurry, reacting for 24 hours at the temperature of 80 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 65 ℃ for 8 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material, the fly ash and the desulfurized gypsum;
(2) Grinding aid and soluble organic matters are added, and grinding is carried out for 30min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 9min to obtain the concrete mineral admixture based on the concrete waste slurry.
Example 6
The raw materials used for the mineral admixture of this example are shown in Table 6 below.
TABLE 6 composition of raw materials used in EXAMPLE 6
| Raw materials | Concrete waste slurry dry material | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 60 | 30 | 10 | 0 | 0.2 | 0.1 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with a 45-80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 3 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 10%;
(3) Adding sodium sulfate accounting for 0.4% of the mass of the concrete waste slurry, reacting for 24 hours at the temperature of 80 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 65 ℃ for 8 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material and the fly ash;
(2) Grinding aid and soluble organic matters are added, and grinding is carried out for 30min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 10min to obtain the concrete mineral admixture based on the concrete waste slurry.
Comparative example 1
The basic procedure was the same as in example 6, except that fly ash was not added. Concrete mineral admixture of this comparative example contains specific components and contents as shown in table 7 below.
TABLE 7 composition of raw materials used in comparative example 1
| Raw materials | Concrete waste slurry dry material | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 90 | 0 | 10 | 0 | 0.2 | 1.0 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with a 45-80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 3 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 10%;
(3) Adding sodium sulfate accounting for 0.4% of the mass of the concrete waste slurry, reacting for 24 hours at the temperature of 80 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 65 ℃ for 8 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Grinding the concrete waste slurry, grinding aid and soluble organic matters in a three-cylinder planetary ball mill for 30min;
(2) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 10min to obtain the concrete mineral admixture based on the concrete waste slurry.
Comparative example 2
The basic procedure was the same as in example 6, except that no seed crystal was added. Concrete mineral admixture of this comparative example contains specific components and contents as shown in table 8 below.
TABLE 8 composition of raw materials used in comparative example 2
| Raw materials | Concrete waste slurry dry material | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 60 | 30 | 0 | 0 | 0.2 | 1.0 |
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material and the fly ash;
(2) Grinding aid and soluble organic matters are added, grinding is carried out for 30min in a three-cylinder planetary ball mill, and the concrete mineral admixture based on the concrete waste slurry is prepared.
Comparative example 3
The basic procedure is the same as in example 6, except that no grinding aid is added. Concrete mineral admixture of this comparative example contains specific components and contents as shown in table 9 below.
TABLE 9 composition of raw materials used in comparative example 3
| Raw materials | Concrete waste slurry | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 60 | 30 | 10 | 0 | 0 | 1.0 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with an 80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 3 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 10%;
(3) Adding sodium sulfate accounting for 0.4% of the mass of the concrete waste slurry, reacting for 24 hours at the temperature of 80 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 65 ℃ for 8 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material and the fly ash;
(2) Adding soluble organic matters, and grinding for 30min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 10min to obtain the concrete mineral admixture based on the concrete waste slurry.
Comparative example 4
The basic procedure was the same as in example 6, except that no soluble organic was added. Concrete mineral admixture of this comparative example was composed of specific components and contents as shown in the following table 10.
Table 10 composition of raw materials used in comparative example 4
| Raw materials | Concrete waste slurry | Fly ash | Seed crystal | Desulfurized gypsum | Grinding aid | Soluble organic matter |
| Content/kg | 60 | 30 | 10 | 0 | 0.2 | 0 |
The preparation method of the seed crystal in the admixture comprises the following steps:
(1) Sieving the concrete waste slurry with an 80 mu m sieve, and grinding the concrete waste slurry in a colloid mill for 3 hours to obtain colloidal and non-precipitated concrete waste slurry;
(2) 200g of the concrete waste slurry solution is taken and placed in a high-speed shearing homogenizer, tap water is added into the high-speed shearing homogenizer, and the concentration is regulated to 10%;
(3) Adding sodium sulfate accounting for 0.4% of the mass of the concrete waste slurry, reacting for 24 hours at the temperature of 80 ℃, and carrying out suction filtration treatment;
(4) And (3) drying the treated sample at 65 ℃ for 8 hours, and grinding to obtain the seed crystal with the granularity (D10) of 4-6 mu m.
The preparation method of the concrete mineral admixture comprises the following steps:
(1) Fully and uniformly mixing the concrete waste slurry dry material and the fly ash;
(2) Grinding aid is added, and grinding is carried out for 30min in a three-cylinder planetary ball mill;
(3) And after finishing grinding, adding seed crystals into the mixture, and mixing and grinding for 10min to obtain the concrete mineral admixture based on the concrete waste slurry.
Performance detection
The fineness (45 μm screen residue), fluidity ratio, 7d activity index, 28d activity index, sulfur trioxide content of the concrete mineral blends prepared based on the concrete waste slurry in examples 1 to 6 and comparative examples 1 to 4, respectively, were tested, and the results are shown in Table 11.
Table 11 properties of concrete mineral admixtures
As can be seen from Table 11, the fineness (45 μm screen residue) of the concrete mineral admixture prepared by the invention is 1-5%, the fluidity ratio is not less than 102%, the 7d activity index is not less than 75%, the 28d activity index is not less than 83%, and the sulfur trioxide content is not more than 3.0%. The fineness is small, the activity index is high, the sulfur trioxide content is low, various properties of the product are excellent, the added value is high, and the ratio of the highest activity index can be as follows: the 7d activity index is 80%, and the 28d activity index is 88%.
In combination with comparative example 1, the addition of fly ash and desulfurized gypsum improved the fluidity ratio of the concrete mineral admixture while improving the fineness and activity index of the mineral admixture, but the addition of fly ash and desulfurized gypsum slightly increased the SO of the mineral admixture 3 The content is as follows. In combination with comparative example 2, the addition of seed crystals significantly improved the activity index of the concrete mineral admixture based on the concrete waste slurry, and improved the mechanical properties of the concrete mineral admixture. In combination with comparative example 3, the grinding aid is added to improve the fineness of the mineral admixture, and compared with the grinding aid which is not added, the fineness of the concrete mineral admixture based on the concrete waste slurry is reduced by 7.3%, and the reduction of the fineness also has positive influence on the activity index of the concrete mineral admixture, so that the activity index of the concrete mineral admixture is further improved. In combination with comparative example 4, the soluble organics improved the fluidity ratio of the concrete mineral admixture based on the concrete waste slurry, improving the water demand ratio.
Claims (7)
1. The concrete mineral admixture based on the concrete waste slurry is characterized by comprising the following raw materials in parts by weight: 50-60 parts of concrete waste slurry, 30-40 parts of fly ash, 5-10 parts of seed crystal, 0-5 parts of desulfurized gypsum, 0.1-0.2 part of grinding aid and 0.05-0.1 part of soluble organic matters; wherein the grinding aid is a mixture of triethanolamine and triglyceride with the mass ratio of 1:0.5-1, and the soluble organic matter is a mixture of polyether polyol and polyethylene glycol with the mass ratio of 1:0.8-1;
the seed crystal is prepared by the following steps: adjusting the mass concentration of the concrete waste slurry to 5-10%, adding sodium sulfate accounting for 0.2-0.4% of the mass of the concrete waste slurry, reacting for 20-24h at 70-80 ℃, drying for 6-8h at 60-65 ℃ after suction filtration, and grinding to obtain the seed crystal.
2. The concrete mineral admixture based on concrete waste slurry according to claim 1, wherein: before the mass concentration of the concrete waste slurry is regulated, the concrete waste slurry is firstly sieved by a 45-80 mu m sieve, and is ground for 2-3 hours after sieving, so that the colloidal and non-precipitated concrete waste slurry is prepared.
3. The concrete mineral admixture based on concrete waste slurry according to claim 1, wherein: the grain size of the seed crystal is 4-6 mu m.
4. The concrete mineral admixture based on concrete waste slurry according to claim 1, wherein: the concrete waste slurry comprises the following components in percentage by mass: siO (SiO) 2 38-42％，CaO 35-40％，Al 2 O 3 7-9％，Fe 2 O 3 5-8% and 4-6% MgO.
5. The concrete mineral admixture based on concrete waste slurry according to claim 1, wherein: siO in the fly ash 2 The content is more than or equal to 50 percent, al 2 O 3 The content is more than or equal to 20 percent, and the fineness of the screen residue of 45 mu m is less than or equal to 20 percent.
6. The concrete mineral admixture based on concrete waste slurry according to claim 1, wherein: caSO in the desulfurized gypsum 4 ≥40％。
7. A method of preparing the concrete mineral admixture of claim 1, comprising the steps of: mixing the concrete waste slurry, the fly ash and the desulfurized gypsum uniformly, adding the grinding aid and the soluble organic matters, grinding for 20-30min, adding the seed crystal, and mixing and grinding for 5-10min to obtain the concrete mineral admixture.
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| JP2000264749A (en) * | 1999-03-17 | 2000-09-26 | Misawa Homes Co Ltd | Method for recycling of waste slurry |
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| CN113024149B (en) * | 2021-03-17 | 2022-02-08 | 筑友智造科技投资有限公司 | Preparation method of crystal nucleus type early strength agent |
| CN113173723A (en) * | 2021-06-03 | 2021-07-27 | 中建西部建设建材科学研究院有限公司 | Mineral admixture for concrete and preparation method thereof |
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| CN105645800A (en) * | 2015-12-31 | 2016-06-08 | 中建商品混凝土成都有限公司 | Waste slurry recycling and reusing technology of concrete mixing station |
| CN110563350A (en) * | 2019-04-04 | 2019-12-13 | 华南理工大学 | Crystal-type early strength agent and preparation method thereof |
| CN110963735A (en) * | 2019-12-22 | 2020-04-07 | 湖北工业大学 | Nano crystal nucleus early strength agent for steam-curing-free precast concrete member |
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Application publication date: 20220722 Assignee: YANCHENG FUQI CONCRETE Co.,Ltd. Assignor: Jiangsu Botuo new building materials Co.,Ltd. Contract record no.: X2024980000850 Denomination of invention: A concrete mineral admixture based on concrete waste slurry and its preparation method Granted publication date: 20230523 License type: Common License Record date: 20240118 |